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Joaquim M.F. dos Santos

Joaquim M.F. dos Santos

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Joaquim M.F. dos Santos

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  1. Scintillation Readout From Micropatterned Electron Multipliers For Dual-phase Dark Matter Detectors Joaquim M.F. dos Santos GIAN – Atomic and Nuclear Instrumentation Group • University of Coimbra • University of Aveiro • Weizmann Institute of Sciences Micro-pattern Gas Detectors (RD51) Workshop 16-18 April 2008, Nikhef, Amsterdam, The Netherlands

  2. Scintillation vs. Charge Scintillation Higher Amplitude Lower Statistical Fluctuations C. A. N. Condeand A. J. P. L. Policarpo, Nucl. Instr. Meth. Vol. 53 (1967) 7-12 • A. J. P. L. Policarpo andC. A. N. Conde, Nucl. Instr. Meth. Vol. 55 (1967) 105-119 RD51 NIKHEF APRIL 2008

  3. Optical TPCs • A. Breskin, R. Chechik, Z. Fraenkel, D. Sauvage et al., Nucl. Instr. Meth. A 273 (1988) 798 Only few applications • U. Titt, A. Breskin, R. Chechik, V. Dangendorf et al., Nucl. Instr. Meth. A 416 (1998) 85 • F.A.F. Fraga, L.M.S. Margato, S.G.T. Fetal, et al., Nucl. Instr. Meth. A 471 (2001) 125 • S.T.G. Fetal, F.A.F. Fraga, L.M.S. Margato, et al., Nucl. Instr. Meth. A 581 (2007) 202 • L. Weissman, M. Gai, A. Breskin, R. Chechik et al., J. Inst. 1 P05002 RD51 NIKHEF APRIL 2008

  4. Recent Relevant Applications of Optical TPCs • E. Aprile, K.L. Giboni, P. Majewski, et al., New Astron. Rev. 49 (2005) 289 • D.Yu. Akimov, G.J. Alner, H.M. Araújo, et al., Astrop. Phys., 27 (2007) 46 • P. Benetti, R. Acciarri, F. Adamo, et al., Astrop. Phys. 28 (2008) 495–507 Dark Matter search XENON, LUX, ZEPELIN, WARP experiments • Secondary scintillation • amplification, for higher sensitivity, with PMT readout • Double mesh, uniform field scintillation gap e.g. secondary scintillation yield of 466 photons/e-/cm @4.1 kV/cm/bar (C.M.B. Monteiro et al., J. Inst. 2 P05001) RD51 NIKHEF APRIL 2008

  5. GEM scintillation vs. charge readout - 1 RD51 NIKHEF APRIL 2008 A.S. Conceição, et al., J. Inst. 2 P09010

  6. GEM scintillation vs. charge readout - 2 RD51 NIKHEF APRIL 2008

  7. GEM scintillation vs. charge readout - 3 RD51 NIKHEF APRIL 2008

  8. Scintillation Yield - 1 RD51 NIKHEF APRIL 2008

  9. Scintillation Yield - 2 RD51 NIKHEF APRIL 2008

  10. Micro Hole & Strip Plate RD51 NIKHEF APRIL 2008

  11. MHSP vs. GEM RD51 NIKHEF APRIL 2008 Gain above 105in scintillation readout mode

  12. Summary - 1 Secondary scintillation for signal readout high gains + good energy resolution with single-GEM at low voltages Stable operation without discharges Max Gainscint 100  Max Gaincharge above 2 bar Energy Resolscint 0.5  Energy Resolcharge GEM-APD or MHSP-APD scintillation readout Good alternative to double stainless steel mesh-PMT readout (reduced background for DM search experiments) Suitable GEM voltages → GEM scintillation yield higher than for uniform field RD51 NIKHEF APRIL 2008 MHSP-APD gains  105 → single electron detection with high efficiency

  13. Summary- 2 • More attractive than scintillation readout charge readout alternatives with micropattern devices • capable of overcoming charge gain limitations of GEM • in high pressure xenon and argon • for large detection areas THGEM Micromegas Nevertheless, scintillation hassignificant advantages Potential alternatives: • readout of scintillation from micropattern devices • simultaneous readout of secondary charge and scintillation • from micropattern devices improved Energy and Position resolution RD51 NIKHEF APRIL 2008

  14. 0-neutrino Double-beta Decay and WIMPs: Will the Searches Converge? David Nygren LBNL / Stockholm U

  15. The EXO-200 detector: a dual TPC charge drift direction cathode crossed wire planes and avalanche photodiodes Coimbra 9 April 2008 NIM A581 (2007) 632-642 field shaping rings

  16. Future work Study the performance characteristics obtained reading the scintillation produced along the charge avalanches of THGEMand MHSPwith Large Area APD. RD51 NIKHEF APRIL 2008